Q. Which of the following statements is not correct?
A) In oxyhaemoglobin ${Fe}^{2 +}$ is paramagnetic
B) During respiration the size of ${Fe}^{2 +}$ increases when it changes from diamagnetic to paramagnetic state
C) Four haeme groups are present in haemoglobin
D) Haeme is the prosthetic group and it is non-protein part
Explanation
(a)
Haemoglobin is porphyrin complex of ferrous iron being coordinated to four nitrogen atoms and additionally coordinated to a water reversible by a molecule. The water molecule appears to be replaceable reversible by a molecule of oxygen to give oxyhaemoglobin. $Fe^{2 +}$ is diamagnetic due to strong field ligands.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.